package com.hbnu.abstract1;

/**
 * 抽象类
 *
 * @author kittychen
 * @date 2025-09-16 10:05
 */
public abstract class AbstractDemo01 {

    private String username;
    private static int age;

    public final static double PI = 3.1415926;

    public AbstractDemo01() {
    }

    public AbstractDemo01(String username) {
        this.username = username;
    }

    public void method01() {
        System.out.println("这不是一个抽象方法");
    }

    public abstract void method02();

    public abstract void method03();
}
